Civil Services Prep

Prelims 2013 · Science and Technology · Question 43

Which of the following statements is/are correct?

  1. Viruses lack enzymes necessary for the generation of energy.
  2. Viruses can be cultured in any synthetic medium.
  3. Viruses are transmitted from one organism to another by biological vectors only.

Select the correct answer using the codes given below.

  1. 1 only
  2. 2 and 3 only
  3. 1 and 3 only
  4. 1, 2 and 3

Answer

1 only

  1. Correct. Viruses do not have their own cellular machinery for metabolism and ATP generation; they depend on the host cell for energy and biosynthesis.

  2. Incorrect. Viruses cannot be cultured in just any synthetic medium; they require living host cells, tissues, or embryonated eggs for replication.

  3. Incorrect. Viruses are not transmitted only by biological vectors; they can spread by air, contact, droplets, food/water, body fluids, and also by vectors in some cases.

Hence, only statement 1 is correct.

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